VIVOSUN Durable Waterproof Seedling Heat Mat Warm Hydroponic Heating Pad 10" x 20.75" MET Standard RELIABLE RESULTS: VIVOSUN's professional heat mat maintains temperatures in the sweet spot of around 10-20 above ambient air temperature - perfect forseed starting and cutting propagation! BUILT TO LAST: Supple, flexible and ultra-durable, VIVOSUN goes beyond stringent MET standards, with a fortified connection between mat and power cord, water-resistance that enables safe scrubbing and a 1-year warranty. STABLE, UNIFORM HEAT: VIVOSUN's strengthened Alloy Nikrothal heating wire and extra layer of insulating PET film ensure this durable mat never scorches your roots and produces lots of revitalizing dew when used with a humidity dome. BEST SAVINGS IN THE MARKET: This 10" x 20.75" mat is perfect for standard 1020 trays and slightly larger than comparable mats on the market; it also runs on only 18 Watts to help you save on electricity. CONVENIENT STORAGE: Delivered in a high-quality, reusable storage bag, the mat flattens out when heating up and can also be rolled back up for easy storage. VIVOSUN&#039;s heat-mat technology hits that sweet spot temperature around 10-20 above ambient air temperature - perfect for seed starting and cutting propagation! After covering with a humidity dome, the mat gets warm enough to create dew throughout the plastic dome, keeping your plants from drying out. Keeps a steady temperature and distributes heat evenly, even in the cold (with an insulating layer underneath). VIVOSUN&#039;s upgraded Alloy Nikrothal heating wire ensures uniform heating and unbeatable durability. The multi-layer construction, with an extra layer of insulating PET film, gives you complete assurance this heat mat won&#039;t overheat or scorch your delicate roots when left on 24 hours a day.